53 lines
1.9 KiB
TypeScript
53 lines
1.9 KiB
TypeScript
/** Validate portable model containers before allowing renderer-side resource loads. */
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export function inspectModel(bytes: Uint8Array, name: string) {
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if (bytes.byteLength < 12 || bytes.byteLength > 25 * 1024 * 1024)
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throw Error("Размер модели: 12 байт — 25 МБ");
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let gltf: any;
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if (name.toLowerCase().endsWith(".gltf"))
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gltf = JSON.parse(new TextDecoder().decode(bytes));
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else {
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const view = new DataView(bytes.buffer, bytes.byteOffset, bytes.byteLength);
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if (
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view.getUint32(0, true) !== 0x46546c67 ||
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view.getUint32(4, true) !== 2 ||
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view.getUint32(8, true) !== bytes.byteLength
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)
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throw Error("Некорректный GLB v2");
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if (bytes.byteLength < 20 || view.getUint32(16, true) !== 0x4e4f534a)
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throw Error("GLB не содержит JSON");
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const length = view.getUint32(12, true);
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if (length > bytes.byteLength - 20) throw Error("Повреждён JSON GLB");
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gltf = JSON.parse(
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new TextDecoder()
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.decode(bytes.subarray(20, 20 + length))
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.replace(/\0+$/, ""),
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);
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}
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if (gltf.asset?.version !== "2.0") throw Error("Поддерживается glTF 2.0");
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if (
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[...(gltf.buffers || []), ...(gltf.images || [])].some(
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(r: any) => r.uri && !r.uri.startsWith("data:"),
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)
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)
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throw Error("Экспортируй GLB со встроенными текстурами и буферами");
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const compressed = [
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"KHR_draco_mesh_compression",
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"EXT_meshopt_compression",
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"KHR_texture_basisu",
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];
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if (
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[...(gltf.extensionsUsed || []), ...(gltf.extensionsRequired || [])].some(
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(x) => compressed.includes(x),
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)
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)
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throw Error(
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"Для автономного экспорта 0.1 используй GLB без Draco, Meshopt и KTX2",
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);
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return {
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clips: (gltf.animations || []).map(
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(a: any, i: number) => a.name || "Animation " + i,
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),
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skeletons: (gltf.skins || []).length,
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};
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}
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